package com.zipeng;

import org.springframework.boot.CommandLineRunner;
import org.springframework.core.env.Environment;

import java.util.Objects;

/**
 * @author: zipeng Li
 * 2021/4/13  9:10
 */
public class CustomCommandLineRunner implements CommandLineRunner {

    Environment env;

    // 使用构造方法的方式，注入Environment
    public CustomCommandLineRunner(Environment env){
        this.env = env;
    }

    @Override
    public void run(String... args) throws Exception {
        System.out.println("利用Spring Boot自动装配的CommandLineRunner");

        // 利用random的RandomValuePropertySource产生一个32位随机字符串
        System.out.println("生成一个随机字符串：".concat(Objects.requireNonNull(env.getProperty("random."))));
    }
}

